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https://issues.apache.org/jira/browse/HADOOP-13075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15840142#comment-15840142
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Andrew Olson commented on HADOOP-13075:
---------------------------------------

[~moist] I think you're misunderstanding. We absolutely shouldn't change the 
value of that constant in any case (we could introduce a second alternative 
value, but the original value must still always be honored). The name changing 
is also very undesirable, but that would only be a inconvenience for breaking 
builds and requiring a code change to successfully compile again. However the 
value changing would quietly break existing deployments where the configuration 
is not handled programmatically using the constant, but rather loaded from some 
external resource such as a conf.xml file.

> Add support for SSE-KMS and SSE-C in s3a filesystem
> ---------------------------------------------------
>
>                 Key: HADOOP-13075
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13075
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Andrew Olson
>            Assignee: Federico Czerwinski
>
> S3 provides 3 types of server-side encryption [1],
> * SSE-S3 (Amazon S3-Managed Keys) [2]
> * SSE-KMS (AWS KMS-Managed Keys) [3]
> * SSE-C (Customer-Provided Keys) [4]
> Of which the S3AFileSystem in hadoop-aws only supports opting into SSE-S3 
> (HADOOP-10568) -- the underlying aws-java-sdk makes that very simple [5]. 
> With native support in aws-java-sdk already available it should be fairly 
> straightforward [6],[7] to support the other two types of SSE with some 
> additional fs.s3a configuration properties.
> [1] http://docs.aws.amazon.com/AmazonS3/latest/dev/serv-side-encryption.html
> [2] 
> http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingServerSideEncryption.html
> [3] http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingKMSEncryption.html
> [4] 
> http://docs.aws.amazon.com/AmazonS3/latest/dev/ServerSideEncryptionCustomerKeys.html
> [5] http://docs.aws.amazon.com/AmazonS3/latest/dev/SSEUsingJavaSDK.html
> [6] 
> http://docs.aws.amazon.com/AmazonS3/latest/dev/kms-using-sdks.html#kms-using-sdks-java
> [7] http://docs.aws.amazon.com/AmazonS3/latest/dev/sse-c-using-java-sdk.html



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